University of Cambridge > Talks.cam > BPI Seminar Series > 'Mixing in Gravity Currents' and 'Gravity Driven Flow in a Horizontal Annulus'

'Mixing in Gravity Currents' and 'Gravity Driven Flow in a Horizontal Annulus'

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Mixing in Gravity Currents

A series of new laboratory experiments have been carried out to measure the mixing in finite volume release currents and in currents produced from a steady source, propagating along a two-dimensional horizontal channel. A light attenuation technique was used to measure the distribution and evolution of the density of the flow, and dye studies were used to follow the motion of the current and the ambient fluid. In both types of currents, a strong circulation develops in the head of the current; as current fluid reaches the front of the flow, it rises and mixes with ambient fluid which is displaced upwards over the advancing head. The total volume and the total volume flux, respectively, are increasing with time. In the case of currents produced from a steady source, the data reveal two main areas of mixing: immediately following inflow of the buoyant fluid to the tank and at the head of the current. The partitioning of the mixing between these two regions depends on the source Froude number.

Gravity Driven Flow in a Horizontal Annulus

During the horizontal drilling process an annular void is created between the casing and drill hole. This void is initially full of a drilling fluid commonly referred to as mud. Once drilling has been completed the annulus is filled with cement, which upon curing, will add stability and integrity to the wellbore. The interface between the cement and mud – during the displacement procedure – is crucial to determining the quality of the well (Eduardo et al; 2004). In this talk I will outline a 2D model, and its implications on curing time, for the time-dependent interaction of this mud-cement interface after the cement has stopped being pumped.

This talk is part of the BPI Seminar Series series.

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